Core-drill.



' PATENTED MAY 23, 1905.

V 0. A. TERRY.

GORE DRILL.

APPLIOATION FILED JUNE 10. 1904.

V r i 1 v i I Q INVENTOB fli/M- ATTORNEYS.

UNITED STAT S:

duce wear upon the fiatented May 21 PATENT OFFIC COLEMAN A. TERRY, OF NEW YORK, N. Y., ASSIGNOR TO DAVIS CALYX DRILL COMPANY, OF NEW YORK, N, Y., A CORPORATION OF WEST VIRGINIA.

CORE-DRILL.

SPEGIFIOAEIION formingpart of Letters Patent No. 790,330, dated May 23, 1905. I i

"Application filed 1111 010, 1904. Seria1N o.211,944.

T 0 all whom it may concern,- I

-Be it known that I, COLEMAN ARTHUR TERRY, a citizenof the United States, and a resident of New York, county and State of NewYork, have 'invented certain new and useful Improvements in Core-Drills, of which the following is a specification, reference being had to the accompanying drawings, forminga part thereof.

My invention relates to core-drills. em-' plo ed for boring holes in the earth s strata; an my invention consists in certain improved means for guiding the core-barrel, drill-rods, or other part of the a paratus in termediate the top and bottom 0 the hole.

In core-drillin great difliculty has been experienced in wor ing in certain classes ofmateral on account of the grinding action between the revolvingrcore-barrel and the side walls of the hole.

' barrel and other parts of the rillin' apparatus as to prevent such abrasion,'and t us to rearts. In deep holes, where the len th of drlll-rod used is considerable, the dril rods will also rub against the side of the hole, the length of rods as a whole bowing orbending, owing to their weight.

When so bent, the rods will thresh against the sides of the hole at one or more points, usually at the points of coupling, and will wear severely, often wearing right through. In carrying out my invention, then, I enip 03* ,one' or morebearing-rings, as mayberequire one bearing-ring arranged around or in proximity to the core-barreL'so as to hold the corebarrel away from the sides 1 of the hole, and one or more bearing-rings as ma be required,

. at various points along the dril -'r'ods, an an-.

nular passage-way being provided between the rings and the parts supporting them,

whereby free escape of water and detritus is permitted. My inventionalso consists in certain novel features of construction and combination of parts, as will hereinafter more fully appear.

Iwill now proceed to describe a GQIB-dl'lll bearing-ring.

his grinding action is sosevere with certain materlal as to completely.

employing bearing-rings embod ing m invention and will then point'out t tures in claims. v

In the drawings, Figure 1 is a view in longitudinal sectional elevation of a. core-drill embodying my invention, showing the same e nove feaat work in a holein the ground. Fig. 2 isan enlarged view, in central longitudinal section,

through the plug constituting the core-barrel support and thebea'ring-ring carried thereby Fig. 3 is a view in transverse section, the

plane of section, being taken substantially upon the line 3 3 ofFig. 2. Fig. 4 is a similar sectional views'howing a modified form of The class of drill to which I have shown my present invention applied is the wellknown formof Davis calyx drill; but it will of course be understood that it may equally 'well be ap lied to other forms of drill, The

core-drill i lustrated comprises a drill-rod 1,

a plug 2, into which the lower end of the drillrod 1 is screwed, as at 3, a core-barrel 4,'

screwed onto the lower end of theplug 2, and a calyx or cup 5, carried by the plug at its uper end. The drill-rodl and plugZare holow, as is usual, topermit the passage therei through of water forwashing up1 the detritus e plug 2 for from the foot of the hole. T thepurposes of the present invention is made in twoparts, an upper main body portion 6 and a cap 7. The main body portion has a reduced neck, to which are fitted racerings 8, the upper race-rings being fitted against the shoulder. formed at the commencement of the reduced neck and a lower race-ring fitted u on the reduced-neck and against theshou der formed by the upper e ge of the cap 7. YA bearing-ring 9 surrounds the lug 2 opposite thelreduced neck portion an is supported upon said plug by means of spherical balls 10, which, with the race-rings and runway portions upon-the said ring, constitute ball bearin1gs about which the ring may freely rotate. n assembling the parts the ring is slipped into 0- sition before the cap is secured in place. he

cap is securedin position by a screw-threaded engagement with the body portion of the plug, as shown.

a rat The outer diameter of the bearing-ring 9 is slightly larger than is the diameter of the core barrel 4. In operation, therefore, the rin engages the side of the hole in which the dri l is operating and acts as a bearing member holding the core-barrel, plug, and calyx away from the side of the hole. It will be remembered that in practice the diameter of the hole is always slightl larger than that of the core-barrel, the teet of the bit, if a cutter-bit be used, being ofiset, so as toeflect this result, or if the shot system of drilling be used the working of the shot around the shot bit results in thls excess of diameter; It is of course essential that clearance shall exist between the sides of the core-barrel and the walls of the hole, and for this reason the diameter of the hole always exceeds the diameter of the core-barrel; but whereno'means are employedfor holding the core-barrel central with respect to the hole it has been quite common for the core-barrel to work against one side of the hole and wear badly. The

diameter of the ring is designed to be such as to fairly accurately fit the hole, and no'friction will result because of such engagement, by reason of the fact that the ring is designed to remain stationary, antifriction-bearings being provided between it and the drill, so that the drill will revolve freely against the ring as a bearing member.

The water and detritus washed up from the bottom of the hole flow around the corebarrel, and in order to permit free assage of the same past the rin I referab y employ a fewer number of baIls that would entlrel I may use a fuil won (1 still be spaces between them, owing to their spherical shape, which spaces might be sufiicient to carry up the detritus and probably would be sufficient in shot-drilling; but in'certain other forms of drilling, where the chi s carried up are larger, it would be better to eave'greater space between the balls, so as to prevent any possible clogging of the material beneath the ring.

' In Fig. II have shown a similar bearingring supported upon the cou lin 11, which unites two sections of the dri -ro s together,

, it being understood that in deep earth-boring the drill-rods are necessarily made in sections and joined together by suitable coup lers. I may-employ one' or more of these bearing-rings at various points along the length of the drill-rod, as

may find desirable, such bearing-rings acting to prevent the drill-rod from bowing and threshing against the side of the hole.

In Fig. 4 I have shown-a form of bearingring which I may employ upon the couplers where the difference between the diameter of the hole and that of the drill-rod is very large.

What Iclaimis 1. A core-drill having a bearing-surface and provided with a loose bearin -1;i ng rotatably mounted thereon, substantially as specified, and rovided with a passage-way for water and etritus between the ring-and the bearing-surface supporting it.

, 2. A core-drill having a bearing portion and provided with a loose bearin -ring rotatably mounted thereon, and bali bearings I therefor, a passage-way for water and detritus being provided between the ring and portion supporting it.

3. In acore-drill, the combination with a core-barrel and means for supporting same, of a bearing-ring loosely mounted with res ect to said core-barrel, and of adianicter s ightly larger than the diameter of said corebarrel, and ball-bearings between said bearing-ring and the part carrying it, an annular passa e-way for water and detritus bein provi ed between the said bearing-ring and the part carrying it.

4. In a core-drill, the combination with a drill-rod, a lug comprising a main or. body portion, an a removable cap secured thereto,

said'main or body portion secured to the drill-rod; and a core-barrel secured to the said cap portion of the plug; of a loose bearing-ring isposed between the cap and body portions of the plug, and bearings for the said bearing-ring, ermitting passage past same of water and etritus, substantially as specified.

5. In a core-drill, the combination'with a drill-rod, a lug comprising a main or body portion, an a removable cap secured thereto, said main or body ortion secured to the drill-rod; and a corearrel secured to the said cap portion of theplug; of a loose bearing-ring disposed between the cap and body portions of the plug, and ball bearings for the said bearing-ring, permitting passage past same of water and detritus, substantially as specified.

6. In a core-drill, the combination with a core-barrel and a plug supporting same, said plug. comprising two separate and separable portions, of a bearing-ring rotatively mounted upon said plug and between said two ortions thereof, the diameterof said ringslig itl lar er than the diameter of said core-barre sai plu and ring having raceways for suporting caring-balls, and having an annuar passage-way between them for water and detritus, anda sufiicient number of bearin balls to partially, but not completely, fi 1 said raceways, substantially as specified.

COLEMAN A. TERRY.

Witnesses:

D. HOWARD HAYWOOD, C. L. HALL. 

